(A) The radius $(r)$ of the sphere is $10.5 \, cm$.The formula for the surface area of a sphere is $4 \pi r^{2}$.Substituting the given values:Surface

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(A) The radius $(r)$ of the sphere is $10.5 \, cm$.The formula for the surface area of a sphere is $4 \pi r^{2}$.Substituting the given values:Surface area $= 4 \times \frac{22}{7} \times (10.5)^{2} \, cm^{2}$$= 4 \times \frac{22}{7} \times 10.5 \times 10.5 \, cm^{2}$$= 4 \times 22 \times 1.5 \times 10.5 \, cm^{2}$$= 88 \times 15.75 \, cm^{2}$$= 1386 \, cm^{2}$Therefore,the surface area of the sphere is $1386 \, cm^{2}$.

Class 9 Mathematics Surface Areas and Volumes Textbook - Surface Areas and Volumes

Easy

Find the surface area of a sphere of radius $10.5 \, cm$.
Assume $\pi = \frac{22}{7}$. (in $, cm^{2}$)

A
$1386$
B
$1006$
C
$1300$
D
$9686$

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Find the surface area of a sphere of radius $10.5 \, cm$.Assume $\pi = \frac{22}{7}$. (in $, cm^{2}$)

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$A$ river $3 \,m$ deep and $40 \,m$ wide is flowing at the rate of $2 \,km$ per hour. How much water will fall into the sea in a minute (in $,m^3$)?

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Find the surface area of a sphere of radius $10.5 \, cm$.
Assume $\pi = \frac{22}{7}$. (in $, cm^{2}$)